from django_redis import get_redis_connection
from rest_framework import serializers

from oauth.models import OAuthQQUser
from oauth.utils import OAuthQQ
from users.models import User


class OAuthQQUserSerialzer(serializers.ModelSerializer):
    sms_code = serializers.CharField(label="短信验证码",write_only=True)
    access_token = serializers.CharField(label="操作凭证",write_only=True)
    token = serializers.CharField(read_only=True)
    mobile = serializers.RegexField(label="手机号",regex=r'^1[3-9]\d{9}$')
    class Meta:
        model = User
        fields = ("mobile","password","sms_code","access_token","id","username","token")

        extra_kwargs = {"username" : {'read_only': True,},
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

        #检验数据


    def validate(self, attrs):
        # 检验access_token
        access_token = attrs['access_token']
        print("..."+access_token)
        openid = OAuthQQ.check_bind_user_access_token(access_token)
        if not openid:
            raise serializers.ValidationError('无效的access_token')

        attrs['openid'] = openid


        # 检验短信验证码
        mobile = attrs['mobile']
        sms_code = attrs['sms_code']
        redis_conn = get_redis_connection('verify_codes')
        real_sms_code = redis_conn.get('sms_%s' % mobile)
        if real_sms_code.decode() != sms_code:
            raise serializers.ValidationError('短信验证码错误')

        # 如果用户存在，检查用户密码
        try:
            user = User.objects.get(mobile=mobile)
        except User.DoesNotExist:
            pass
        else:
            password = attrs['password']
            if not user.check_password(password):
                raise serializers.ValidationError('密码错误')
            attrs["user"] = user
        return attrs


    def create(self, validated_data):

        openid = validated_data["openid"]
        user = validated_data.get("user")
        mobile = validated_data["mobile"]
        password = validated_data["password"]

        if not user:
            user = User.objects.create_user(username = mobile,mobile = mobile,password=password)

        OAuthQQUser.objects.create(user= user,openid = openid)

        from rest_framework_jwt.settings import api_settings

        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)

        user.token = token
        return user


